Error message every time Excel opens

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Zorgalex Posted messages 75 Status Member -  
Zorgalex Posted messages 75 Status Member -
Hello everyone,

I'm reaching out because I have an error message that appears every time I open Excel. It also appears every time I return to an Excel window. For example: I open Excel: error message; I switch to Word then return to Excel: error message...

Here’s the message in full:
Error in App_WorkbookActivate Unable to set the Installed property of the AddI class.
I am currently writing a scientific thesis, so let's just say this is driving me crazy for the last two months ^^
Do you have a solution to get rid of this message?

Thanks in advance and have a great day!

4 answers

bazfile Posted messages 58485 Registration date   Status Moderator Last intervention   20 265
 
Hello,
See this issue with Microsoft at this page.

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bazfile security contributor.
1
Redbart Posted messages 20952 Registration date   Status Member Last intervention   3 380
 
Hello
apparently, an error(s) in the workbooks or macros

https://docs.microsoft.com/en-us/office/troubleshoot/excel/workbook-not-activated
0
jeannets Posted messages 28379 Registration date   Status Contributor Last intervention   Ambassadeur 6 600
 
Hello,

You type your message in Google to get answers.

https://docs.microsoft.com/en-US/office/vba/api/Excel.Application.WorkbookActivate

Is it Office 365... what version of Windows.... have you programmed macros..? or not..?
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Zorgalex Posted messages 75 Status Member 4
 
So the problem was resolved by Microsoft support.

For your information, I didn't use VBA or any other stuff like that, just formulas... and I'm on Excel 2016. I had already typed the message into Google, but the suggested help didn't work or I couldn't understand anything ^^"

The support technician went to Options -> Advanced Options -> scrolled down to the bottom of the page and unchecked "Show add-in user interface errors".
Let's just say that this isn't really a problem resolution but rather a way to prevent the error message from appearing. However, for my use, that's more than enough.

Thank you for your help!
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